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Jumbo Frames
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Ethernet frame sizes have traditionally been restricted to a maximum of 1500 Bytes. While this was sufficient for file transfers, this leads to several disadvantages when video is transferred over an Ethernet network. Video packet sizes are usually larger than 1500 Bytes, thus leading to fragmentation of the Video packets in an Ethernet network.
Since each large Video packet is broken into more Ethernet Frames, the excess overhead (from the header size used for each broken Ethernet Frame) leads to more Bandwidth used per Video packet. Also, since there is now larger number of Ethernet Frames to process, there is more Ethernet processing per Video packet increasing the latency, thus leading to drop in performance. All Tejas products support Ethernet Jumbo Frames that are up to a size of 9216 Bytes. Thus, each large Video packet now needs only 1 Ethernet frame header (as against 6 earlier) leading to savings on the bandwidth. The drop in processing overhead further leads to more effective delivery of video across the network.
To summarize, Jumbo Frame support enables efficient (in terms of bandwidth and latency) transmission of Video traffic across an Ethernet network. |
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